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(1851–1902). One of the leaders in conquering the dreaded disease yellow fever was Walter Reed. Until his time yellow fever ravaged tropical and coastal cities, killing thousands of people in yearly epidemics. As head of the United States Army Yellow Fever Commission, Reed led dramatic experiments to learn how the disease is transmitted. By proving that mosquitoes carry yellow fever, Reed and his coworkers opened the way for control of the disease in all communities where precautions are observed.

Reed was born on Sept. 13, 1851, in Belroi, Va. His father, a Methodist minister, gave him good training in classical subjects and mathematics even during the tumultuous years of the American Civil War. When Walter was 15 his family moved to Charlottesville, Va. The next year he entered the University of Virginia. He specialized in medical studies in his second term and received an M.D. degree before he was 18.

In 1869 the tall, serious boy enrolled in the Bellevue Hospital Medical College in New York City for more study. He received a second M.D. degree in 1870. After internship he worked for the New York City and Brooklyn boards of health. In 1875 he entered the Army Medical Corps as a first lieutenant. A year of duty in New York was followed by 11 years at various army posts in the West. In 1876 he married Emilie Lawrence; they had two children.

Reed developed a keen interest in the new science of bacteriology. In 1890 he was transferred to duty in Baltimore, Md., and permitted to study at Johns Hopkins Hospital. After three years he was appointed professor of bacteriology and clinical microscopy at the Army Medical School in Washington, D.C.

At the outbreak of the Spanish-American War, Reed headed a committee to investigate epidemics of typhoid fever raging through army camps. The committee found that flies and dust were helping to spread the disease. Reed recommended sanitation measures that reduced the disease rate. His work led to his appointment in 1900 as head of the Yellow Fever Commission, organized to combat the disease among troops stationed in Havana, Cuba.

Reed realized that the pressing need was to find out how yellow fever was being spread. He and his colleagues investigated the theory suggested by earlier researchers that it was mosquitoes rather than contact with fever victims or their clothing or bedding that transmitted the disease. In a series of controlled experiments they proved the theory. At once strict mosquito-control measures were enforced, and yellow fever epidemics ceased. (See alsomosquito.)

In 1901 Reed returned to Washington and received many awards. A neglected chronic appendicitis caused his death less than two years later on Nov. 22, 1902. A major medical center in Washington, D.C., is named for him.

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